Looks like you're going to have to break with tradition one way or the other. Buying another 16GB of EOL DDR3 will stick in the throat - obviously 2nd hand will take the edge off.
Or, a completely new spangly spec - perhaps delayed by a few months. And, as you're more than aware, there's more benefits than just money saving, when giving new architecture a few months to breathe. You get to watch all the teething problems in the comfort of your chair or via a friend's build.
We would get to watch
@orbitalwalsh fine tune his Gigabyte build - unless he commits to his 9700K comment - in which case we get to take the pee.
I would buy a Zen 2 8c/16t then just for the giggles - although his build may have the early laugh. Yikes...